$\int e^x \cos x \, dx =$

  • A
    $\frac{e^x (\cos x + \sin x)}{2} + c$
  • B
    $\frac{e^x (\sin x - \cos x)}{2} + c$
  • C
    $\frac{e^x (\cos x - \sin x)}{2} + c$
  • D
    $\frac{e^x (\sin x + \cos x)}{2} + c$

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